Overcrowded Organometallic Platinum(II) Complexes That Behave as Molecular Gears

Romeo, Raffaello; Carnabuci, Salvatore; Fenech, Lucia; Plutino, Maria Rosaria; Albinati, Alberto

doi:10.1002/anie.200600827

Cited by 28 publications

(21 citation statements)

References 23 publications

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“…Many other examples of dynamic gearing have since been published including a range of triptycene derivatives, 168 − 174 metallocene-based gears, 175 , 176 conformationally restricted amides, 177 − 181 and a series of propeller molecules and other molecules with selective rotation, 132 , 133 , 139 , 182 − 194 such as 1,2-di- o -tolylnaphthalene moieties. 195 , 196 …”

Section: Controlling Motion In Covalently Bonded Molecular Systemsmentioning

confidence: 99%

Artificial Molecular Machines

et al. 2015

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Section: Controlling Motion In Covalently Bonded Molecular Systemsmentioning

confidence: 99%

Artificial Molecular Machines

et al. 2015

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“…[3] Molecular rotors take their analogies from macroscopic machines and devices. Examples of gyroscopes, [4,5] propellers, [6,7] viscometers, [8][9][10][11][12] oscillators, [13,14] and gears [15,16] have all been demonstrated at a molecular level. [2,17] Fluorescent molecular rotors (FMRs) describe a subset of molecular rotors in which some degree of internal rotation can occur within the excited-state lifetime of the species, to open or close an efficient nonradiative relaxation pathway.…”

Section: Introductionmentioning

confidence: 99%

Porphyrin‐Based Molecular Rotors as Fluorescent Probes of Nanoscale Environments

Ghiggino

Hutchison

Langford

et al. 2007

Adv Funct Materials

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The synthesis, characterization, and photophysical properties of a series of supramolecular triads consisting of a tin(IV) porphyrin with axial ligands of ortho‐, meta‐, and para‐hydroxyphenyl naphthalenediimides are presented. For the meta‐ and para‐hydroxyphenyl derivatives, efficient and solvent‐viscosity‐dependent quenching of porphyrin fluorescence is observed. Experimental and theoretical studies demonstrate that, in these compounds, photoinduced electron transfer from the phenolate to the porphyrin is modulated by large amplitude rotational motions of the naphthalenediimide. These compounds are novel examples of fluorescent molecular rotors, and their potential use as environmental probes of local viscosity and temperature are discussed.

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“…To correlate two or more movable elements in a controllable manner, a stator, which can bring them appropriately close to each other, is a key part of motion. A significant number of excellent examples have been reported on synthetic molecular gearing systems with intramolecularly correlated rotators 4 5 6 7 8 9 . However, the control of rotary transmission between molecular rotators is still in an early phase 10 11 , and therefore, in particular, switchable motion transmission is a challenge.…”

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confidence: 99%

Metal-centred azaphosphatriptycene gear with a photo- and thermally driven mechanical switching function based on coordination isomerism

et al. 2017

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Metal ions can serve as a centre of molecular motions due to their coordination geometry, reversible bonding nature and external stimuli responsiveness. Such essential features of metal ions have been utilized for metal-mediated molecular machines with the ability to motion switch via metallation/demetallation or coordination number variation at the metal centre; however, motion switching based on the change in coordination geometry remain largely unexplored. Herein, we report a PtII-centred molecular gear that demonstrates control of rotor engagement and disengagement based on photo- and thermally driven cis–trans isomerization at the PtII centre. This molecular rotary motion transmitter has been constructed from two coordinating azaphosphatriptycene rotators and one PtII ion as a stator. Isomerization between an engaged cis-form and a disengaged trans-form is reversibly driven by ultraviolet irradiation and heating. Such a photo- and thermally triggered motional interconversion between engaged/disengaged states on a metal ion would provide a selector switch for more complex interlocking systems.

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Overcrowded Organometallic Platinum(II) Complexes That Behave as Molecular Gears

Abstract: The bottom-up approach to functional materials and the development of molecular-sized analogues of mechanical devices, such as shuttles, [1] rotors, [2] brakes, [3] ratchets,

Cited by 28 publications

References 23 publications

Artificial Molecular Machines

Artificial Molecular Machines

Porphyrin‐Based Molecular Rotors as Fluorescent Probes of Nanoscale Environments

Metal-centred azaphosphatriptycene gear with a photo- and thermally driven mechanical switching function based on coordination isomerism

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